/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System.Collections;
using System.Collections.Generic;
using System;
using Composite.Data.Foundation.CodeGeneration;


namespace Composite.Data.Caching
{
    internal sealed class CachingEnumerator<T> : IEnumerator<T>
    {
        private IEnumerator<T> _enumerator;
        private Type _wrapperType;


        public CachingEnumerator(IEnumerator<T> enumerator)
        {
            _enumerator = enumerator;
        }


        public T Current
        {
            get
            {
                object wrapper = Activator.CreateInstance(this.WrapperType, new object[] { _enumerator.Current });

                return (T)wrapper;
            }
        }


        public void Dispose()
        {
            _enumerator.Dispose();
        }


        object IEnumerator.Current
        {
            get
            {
                object wrapper = Activator.CreateInstance(this.WrapperType, new object[] { _enumerator.Current });

                return wrapper;
            }
        }


        public bool MoveNext()
        {
            return _enumerator.MoveNext();
        }


        public void Reset()
        {
            _enumerator.Reset();
        }


        private Type WrapperType
        {
            get
            {
                if (_wrapperType == null)
                {
                    _wrapperType = DataWrapperTypeManager.GetDataWrapperType(typeof(T));
                }

                return _wrapperType;
            }
        }
    }
}
